EWR IAH, not cities flown by SWA. IAH is Houstin Intercontiental a far drive north of the icty. But if you are referring to HOU 9 (Hobby) there are few seats on the AM NS, the evening NS is FULL. If you make connections and can get out of EWR thru STL STL HOU is WIDE OPEN. If you are jumpseat qualified try UA/CO.